Sitewide user reports plugin which produces Multiple User Reports from any course category / course on one page has been updated to a new version recently to support Moodle 2.6 & Moodle 2.7 versions.
The sitewide user report plugin provides a report which can be filtered by course category or course.
You can download the latest version of the sitewide user report plugin from this link: https://moodle.org/plugins/view/gradereport_sitewideuser
